JP4902387B2 - In-pipe cleaning nozzle - Google Patents

Description

  The present invention relates to an in-pipe cleaning nozzle, and more particularly to an in-pipe cleaning nozzle that ensures smooth rotation of a rotating nozzle portion and improves cleaning performance.

The in-pipe cleaning nozzle is inserted into the pipe to be cleaned, and the rotary nozzle advances while rotating by the reaction force for jetting high-pressure water, and the inside of the pipe is washed with the high-pressure water jet pressure.
Conventionally, in the pipe cleaning nozzle, the gap between the shaft and the inner peripheral surface of the rotating nozzle is minimized to ensure the smooth rotation of the rotating nozzle and to suppress the leakage of high-pressure water from the gap. Are known (for example, Patent Documents 1 and 2).

  A conventional in-pipe cleaning nozzle will be described in detail with reference to FIG. FIG. 5 is a schematic cross-sectional view for explaining an outline of a conventional in-pipe cleaning nozzle. In FIG. 5, for convenience of explanation, the gap between the sliding portions of the shaft portion 200 and the rotating nozzle portion 300 is exaggerated and does not reflect the actual size.

As shown in FIG. 5, the conventional in-pipe cleaning nozzle 100 includes a shaft portion 200 into which high-pressure water is introduced, a rotating nozzle portion 300 that is rotatably fitted on a shaft support portion 220 of the shaft portion 200, and a rotating nozzle portion. And a nozzle head 400 that rotatably holds 300 in the axial direction.
The high-pressure water introduced into the shaft portion 200 passes from the nozzle tip 260 through the injection passage 250 via the flow passage 230 formed in a ring shape on the inner peripheral surface of the rotary nozzle portion 300 from the flow passage 230. High pressure water is jetted to remove the deposit S (scale) in the pipe W and clean it.

  Here, the rotary nozzle part 300 is fitted around the shaft support part 220 with a predetermined gap δ3 ′ (clearance) so that it can rotate smoothly. For this reason, part of the high-pressure water introduced into the circulation chamber 240 flows out along the axial direction through the gap δ3 ′ between the shaft support portion 220 of the shaft portion 200 and the inner peripheral surface of the rotary nozzle portion 300, The water is discharged as leaked water from the gap δ1 ′ between the rotary nozzle part 300 and the shaft part 200 and the gap δ2 ′ between the rotary nozzle part 300 and the nozzle head 400, which are formed on both sides of the rotary nozzle part.

Conventionally, in the tube cleaning nozzle, for example, as shown in FIG. 1 of Patent Document 1, by adjusting the rotation speed of the rotating nozzle portion according to the use conditions such as the scale adhesion state and fluid supply pressure, In order to increase the cleaning efficiency, a technique using a magnet brake as a speed control method of the rotating nozzle part is known.
Japanese Patent Laid-Open No. 9-285749 JP-A-9-94547

However, in the conventional pipe cleaning nozzle, the inner diameter of the rotating nozzle portion is increased from the inner diameter side by high-pressure water that has entered the clearance (clearance) between the sliding portion between the outer peripheral surface of the shaft support portion and the inner peripheral surface of the rotating nozzle portion. Receives pressure in the radial direction. For this reason, the amount of leakage cannot be reduced below the set gap, and the working pressure is practically limited to 100 MPa.
On the other hand, if a packing seal is attached to suppress the amount of high-pressure water leakage, the resistance is high, so it cannot be used for small-diameter nozzles with small rotational torque, and there are problems such as short life under high-pressure and high-speed conditions. It was.

  In addition, a strong magnet for a brake used in a magnet brake is expensive and requires a large mounting space, and thus cannot be used for a small-diameter rotating nozzle. Further, the magnet has a problem that it is necessary to take a countermeasure against corrosion in an environment exposed to water.

  Therefore, in order to solve the above-mentioned problems, the present invention firstly aims to increase the pressure fluid by reducing leakage from the sliding portion while ensuring smooth rotation of the rotating nozzle portion. It is an object of the present invention to provide an in-pipe cleaning nozzle. A second object of the present invention is to provide an in-pipe cleaning nozzle capable of controlling the speed of the rotating nozzle unit by a simple and compact brake unit and improving the cleaning performance.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a shaft having a connecting portion to which a high-pressure hose is connected and a shaft support portion in which a flow passage through which a pressure fluid introduced from the high-pressure hose flows is formed. An annular rotary nozzle portion that is rotatably fitted to the shaft support portion, communicates with the flow passage and ejects the pressure fluid, and a nozzle head fixed to the tip of the shaft portion. And a cleaning nozzle for cleaning the inside of the pipe while rotating the rotating nozzle portion by an injection reaction force for ejecting the pressure fluid, wherein the rotating nozzle portion has the shaft It is rotatably held via two bushes arranged at a predetermined interval in the support part, and from the flow passage to the jet outlet via a flow chamber formed between the two bushes. Circulating jet A predetermined gap is provided in the sliding contact portion between the inner peripheral surface of the bush and the outer peripheral surface of the shaft support portion, and a fluid pressure of the pressure fluid is applied from the inner peripheral surface side to the flow passage. A sealing member for sealing the discharge of the pressure fluid is provided in a sliding contact portion between the outer peripheral surface of the bush and the inner peripheral surface of the rotating nozzle portion facing the outer peripheral surface, and the flow A predetermined gap is provided which communicates with the path and applies the fluid pressure of the pressure fluid from the outer peripheral surface side of the bush.

  Here, the term “sliding contact” is used. In addition to the case where both members are in contact with each other while sliding, a fixed gap (a small clearance) is widely provided between both members so that they are relatively close to each other. This terminology is also used when moving.

  In the pipe cleaning nozzle according to claim 1 of the present invention, the rotating nozzle portion is rotatably held via a bush with respect to the shaft support portion, and a predetermined gap is provided on the outer peripheral surface side and the inner peripheral surface side of the bush. The outer peripheral surface side is provided with a sealing member that seals the discharge of the pressure fluid, and the fluid pressure of the pressure fluid is applied from the inner peripheral surface side of the bush. Since the bush is held on the outer peripheral surface of the shaft support by fluid pressure (static pressure), the inner peripheral surface of the bush and the outer surface of the shaft support are not in direct contact, so the friction coefficient is small and wear is reduced. And smooth rotation can be maintained for a long time.

  As described above, since the in-pipe cleaning nozzle according to claim 1 of the present invention slides on the inner diameter side of the bush, the predetermined gap on the inner peripheral surface side of the bush ensures smooth rotation and the sliding portion. Is set to a minimum to reduce leakage from.

Here, due to the fluid pressure (static pressure) of the pressure fluid applied from the inner peripheral surface side of the bush, a pressing force in the diameter expansion direction that attempts to expand the inner diameter acts on the bush. On the other hand, the discharge of the pressure fluid is sealed by the sealing member on the outer peripheral surface side of the bush, and the fluid pressure of the pressure fluid acts also from the outer peripheral surface side of the bush.
As a result, the fluid pressure acts on the bush in a direction in which the fluid pressure from the inner peripheral surface side and the fluid pressure from the outer peripheral surface side are balanced, so even if the fluid pressure is set high, The clearance with the shaft support can be kept to a minimum.

  As a result, the amount of pressure fluid leaking from the inner peripheral surface side of the bush can be minimized. Further, by suppressing the leakage of the pressure fluid to the minimum, the fluid pressure of the pressure fluid can be increased efficiently, and the cleaning performance can be improved.

The invention according to claim 2 is the in-pipe cleaning nozzle according to claim 1, wherein the sealing member is an edge portion on a side far from the flow passage and the jet outlet on the outer peripheral surface side of the bush. It is characterized by being provided in.
According to such a configuration, the fluid pressure of the pressure fluid can be applied over a wide range of the outer peripheral surface of the bush, so that it is possible to balance the fluid pressure from the inner peripheral surface side of the bush.

  A third aspect of the present invention is the in-pipe cleaning nozzle according to the first or second aspect, wherein a part of the pressure fluid is discharged through a predetermined gap provided on the inner peripheral surface side of the bush. And a brake part having a predetermined gap provided in a head side sliding contact part where the rotating nozzle part and the nozzle head face and come into sliding contact with each other, and the discharge path and the head side sliding contact The brake portion includes a concavo-convex portion that agitates or shears the pressure fluid discharged from the inner peripheral surface side of the bush to regulate the rotational speed of the rotary nozzle portion, and the rotary nozzle portion. And at least one of the nozzle heads.

  The invention according to claim 4 is the pipe cleaning nozzle according to claim 1 or 2, wherein a part of the pressure fluid is discharged through a predetermined gap provided on the inner peripheral surface side of the bush. A discharge path, and a brake part having a predetermined gap provided in a connecting part side sliding contact part where the rotating nozzle part and the shaft part face and come into sliding contact with each other, and the discharge path and the connecting part side The brake portion communicates with the sliding contact portion, and the brake portion rotates the uneven portion that regulates the rotational speed of the rotating nozzle portion by stirring or shearing the pressure fluid discharged from the inner peripheral surface side of the bush. It is characterized by being provided on at least one of the slip portion and the shaft portion.

  According to the third and fourth aspects, the head side sliding contact portion or the coupling portion side sliding contact portion is provided with a brake portion, and the brake fluid is agitated or pressed with the pressure fluid discharged from the inner peripheral surface side of the bush. By providing an uneven portion that shears and regulates the rotation speed of the rotating nozzle portion, the rotational speed of the rotating nozzle portion can be controlled using the viscous resistance of the pressure fluid and the resistance caused by the vortex generated in the uneven portion as a braking force. it can. In addition, the discharge amount can be suppressed by increasing the discharge resistance of the pressure fluid by the brake unit. In addition, since the brake unit having such a configuration utilizes the resistance of the pressure fluid and does not use a magnet, it is inexpensive and can maintain stable cleaning performance.

  First, the in-pipe cleaning nozzle according to the present invention can reduce the leakage from the sliding portion and increase the pressure fluid pressure while ensuring smooth rotation of the rotating nozzle portion. Secondly, the in-pipe cleaning nozzle according to the present invention enables speed control of the rotating nozzle part by a simple and compact brake part, and can improve the cleaning performance.

A first embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
In the drawings to be referred to, FIG. 1 is a cross-sectional view for explaining the configuration of the in-pipe cleaning nozzle according to the embodiment of the present invention, and FIG. 2 is for explaining the configuration of the in-pipe cleaning nozzle according to the embodiment of the present invention. It is a perspective view. FIG. 3A is a schematic cross-sectional view for explaining the arrangement of the injection ports of the rotating nozzle portion, and shows a cross section along the flow path for convenience. FIG. 3B is an XX cross-sectional view of (a) for explaining the configuration of the brake part, and FIG. 3C is a partially enlarged cross-sectional view of (a) showing the flow of high-pressure water around the bush. .
In these drawings, for the sake of convenience of explanation, the sliding contact portion and the gap between the sliding portions are exaggerated and do not reflect the actual size.

As shown in FIGS. 1 and 2, the in-pipe cleaning nozzle 1 according to the embodiment of the present invention includes a shaft portion 2 into which high-pressure water that is a pressure fluid is introduced, and a rotation that is rotatably supported by the shaft portion 2. The nozzle part 3 and the nozzle head 4 fixed to the front-end | tip of the shaft part 2 are provided.
The rotating nozzle portion 3 is rotatably held by the shaft portion 2 via two bushes 5, and an O-ring 6 that is a sealing member is fitted on the outer peripheral surface of the bush 5.

In the following description, the connecting portion 21 side may be referred to as the rear side and the nozzle head 4 side may be referred to as the front side (front end side) with reference to the traveling direction of the in-pipe cleaning nozzle 1.
In this embodiment, water (high-pressure water) is used as the cleaning fluid that is a pressure fluid, but the present invention is not limited to this, and depending on the type of tube to be cleaned, the nature of the deposits, etc. These gases and various liquids such as various chemical cleaning solutions can be appropriately selected according to the use conditions.

As shown in FIG. 1, the shaft portion 2 is formed with a connecting portion 21 to which a high pressure hose (not shown) is connected and high pressure water is introduced, and a flow passage 23 through which the high pressure water introduced into the connecting portion 21 flows. And a shaft support portion 22.
In the shaft portion 2, the connecting portion 21 and the shaft support portion 22 are integrally coupled, and the connecting portion 21 has a bowl-like shape having a larger diameter than the shaft support portion 22. The flange-like end surface 21 b on the shaft support portion 22 side of the connecting portion 21 is in sliding contact with the end surface 32 a of the rotating nozzle portion 3 with a predetermined gap δ 1 at the connecting portion-side sliding contact portion 24. That is, in the connecting portion side slidable contact portion 24, the rotary nozzle portion 3 and the shaft portion 2 face and slidably contact each other, and the slidable contact surface is a rotational axis of the rotary nozzle portion 3 from the shaft support portion 22 toward the radially outer side. It is formed in a disk shape along a direction orthogonal to the. With this configuration, high pressure water (leakage water) discharged through the inner peripheral surface side of the bush 52 is introduced into the connecting portion side sliding contact portion 24.
The flow passage 23 is formed from the inlet 21 a formed in the rear end surface of the connecting portion 21 to the vicinity of the center in the axial direction of the shaft support portion 22.
Further, a screw 22 a is processed at the tip of the shaft support portion 22 and the nozzle head 4 is mounted.

The rotary nozzle portion 3 has an annular shape having an inner peripheral surface and an outer peripheral surface. On the outer peripheral surface, the reduced diameter portion 31 on the nozzle head 4 side (front side) and the increased diameter on the connecting portion 21 side (rear side). A stepped shape formed with the portion 32 is provided.
And the uneven | corrugated | grooved part 33 which comprises the brake part which regulates the rotational speed of the rotating nozzle part 3 by the viscous resistance of high pressure water etc. is formed in the outer peripheral surface of the diameter reducing part 31 of the rotating nozzle part 3 (FIG. 2). (See also FIG. 3 (b)).
In addition, a nozzle tip 34 is provided on the outer peripheral surface of the enlarged diameter portion 32. The nozzle tip 34 is formed with an outlet 34a that communicates with the flow passage 23 and ejects high-pressure water.
High-pressure water introduced into the connecting portion 21 is supplied to the jet port 34a from the flow passage 23 through the flow chamber 23a through the jet channel 23b, and high-pressure water is jetted from the jet port 34a. The jet S of jetted high-pressure water removes the deposits S in the pipe W and cleans them.

Here, as shown in FIG. 1, the jet nozzle 34 a is inclined to the rear side (right side in the figure) with respect to a direction (vertical direction in the figure) perpendicular to the rotation axis of the rotary nozzle portion 3. It is installed. Thereby, the thrust which moves forward by the jet reaction force which jets high pressure water can be obtained.
Further, as shown in FIG. 3A, the ejection port 34 a is disposed eccentrically in the radial direction from the rotation axis of the rotary nozzle portion 3. Thereby, the rotational force of the rotation nozzle part 3 can be obtained by the ejection reaction force which ejects high pressure water.

  In the present embodiment, four jet outlets and jet channels are provided. However, the present invention is not limited to this, and is appropriately set according to the specifications such as the allowable number of rotations of the in-pipe cleaning nozzle 1, for example, About 2 to 6 places are provided.

  The bush 5 (51, 52) is externally fitted to the shaft support portion 22 and is attached to the inner peripheral surface side of the rotary nozzle portion 3 via an O-ring 6. Two bushes 5 are provided at both edges of the inner peripheral surface of the rotary nozzle portion 3 with a predetermined interval, and a high pressure is provided between the end surface of the bush 51 and the end surface of the bush 52 by providing this interval. A ring-shaped circulation chamber 23a into which water is introduced is formed.

  And as shown in FIG.3 (c), the flow path 23 (through the circulation chamber 23a is provided in the sliding contact part of the outer peripheral surface of the bush 5, and the inner peripheral surface of the rotation nozzle part 3 which faces this outer peripheral surface. A predetermined gap δ3 is provided which communicates with FIG. 1) and applies the pressure p3 of the high-pressure water from the outer peripheral surface side of the bush 5.

  Here, the predetermined gap δ3 means an amount that is ½ of the value obtained by subtracting the outer diameter of the bush 5 from the inner diameter of the rotary nozzle 3, and is necessary for the assembly of the rotary nozzle 3 and the bush 5. It is set appropriately in consideration of a clear clearance.

  The O-ring 6 is provided on the outer peripheral surface side of the bushes 51 and 52 at the edge on the side far from the flow passage 23 and the jet port 34a. That is, the high pressure water that has entered the outer peripheral surface of the bush 5 from the circulation chamber 23a can enter the other end of the bush 5 (see also FIG. 3 (c)), so that the circulation chamber 23a side (flow passage 23 and The O-ring 6 is attached to the edge of the bush 5 on the side far from the side where the jet outlet 34a is located.

  On the other hand, on the inner peripheral surface side of the bush 5, the sliding contact portion between the inner peripheral surface of the bush 5 and the outer peripheral surface of the shaft support portion 22 communicates with the flow passage 23 (FIG. 1) via the circulation chamber 23a. In addition, a predetermined gap δ4 necessary for smoothly rotating the bush 5 and the rotating slip portion 3 is provided.

  Here, the predetermined gap δ4 means an amount that is ½ of the value obtained by subtracting the outer diameter of the shaft support 22 from the inner diameter of the bush 5, and specifically, the bush 5 and the shaft support 22 It is set as appropriate in consideration of the sliding conditions. For example, if the gap δ4 is too large, the amount of high-pressure water leakage increases, and if the gap δ4 is too small, the frictional resistance increases. For this reason, it is set to an appropriate gap that ensures smooth sliding characteristics and minimizes leakage water.

With this configuration, as shown in FIG. 3C, the high-pressure water introduced into the circulation chamber 23a is sealed by providing a gap δ3 and providing an O-ring 6 at the edge on the outer peripheral surface side of the bush 5. As a result, the pressure p3 of the high-pressure water acts in the direction of reducing the diameter of the bush 5 from the outer peripheral surface side of the bush 5 (the direction of decreasing the gap δ4).
On the other hand, on the inner peripheral surface side of the bush 5, by providing the gap δ4, the pressure of the high-pressure water is increased in the direction of expanding the bush 5 from the inner peripheral surface side of the bush 5 (in the direction of increasing the gap δ4). p4 acts.

  As shown in FIG. 1, the nozzle head 4 is formed in a cylindrical shape with a bottom end, and is screwed into and fixed to the distal end portion of the shaft support portion 22 (see also FIG. 2). On the inner peripheral surface side of the cylindrical shape, as shown in FIG. 3 (b), the rotary nozzle portion 3 is placed at a position facing the concavo-convex portion 33 formed on the outer peripheral surface of the shaft support portion 22 by the viscous resistance of high-pressure water. Concave and convex portions 41 that regulate the rotation speed are formed to constitute a brake portion.

The nozzle head 4 is in sliding contact with the end surface 32 b of the rotating nozzle portion 3 and the outer peripheral surface of the reduced diameter portion 31 with a predetermined gap δ 2 at the head side sliding contact portion 42.
That is, in the head-side sliding contact portion 42, the rotary nozzle portion 3 and the nozzle head 4 face and come into sliding contact with each other, and the head-side sliding contact portion 42 has a sliding contact portion 42 a in a direction intersecting the rotation axis of the rotary nozzle portion 3. 42c and the sliding contact portion 42b in the direction along the rotation axis of the rotary nozzle portion 3 are disposed in combination. The sliding contact portion 42 communicates with a discharge path 42d through which high-pressure water discharged from the inner peripheral surface side of the bush 51 is introduced, and an uneven portion 41 is formed in the sliding contact portion 42b.
With this configuration, leakage water discharged through the inner peripheral surface side of the bush 51 is introduced into the head side sliding contact portion 42.

Subsequently, the operation of the in-pipe cleaning nozzle 1 according to the embodiment of the present invention will be described mainly with reference to FIGS. 1 and 3C.
The tube cleaning nozzle 1 is inserted into the tube W to be cleaned. Then, the high-pressure water introduced into the flow passage 23 formed in the shaft portion 2 is ejected from the ejection port 34a of the nozzle tip 34 through the ejection channel 23b from the circulation chamber 23a. The jet reaction force causes the rotary nozzle portion 3 to move forward and clean the inside of the pipe W.

  In the in-pipe cleaning nozzle 1 according to the embodiment of the present invention, as described above, the rotary nozzle portion 3 is externally fitted to the shaft support portion 22 via the bush 5, and the outer peripheral surface side and the inner peripheral surface side of the bush 5. Are provided with predetermined gaps δ3 and δ4, respectively, an O-ring 6 for restricting the discharge of high-pressure water is provided on the outer peripheral surface side, and a portion of the high-pressure water is discharged from the inner peripheral surface side of the bush 5 Since the bush 5 is held by the pressure (static pressure) of high-pressure water on the inner peripheral surface side, the inner peripheral surface of the bush 5 and the outer peripheral surface of the shaft support portion 22 are not in direct contact with each other. Smooth rotation can be maintained for a long time by reducing wear.

  Here, due to the pressure of the high-pressure water discharged from the inner peripheral surface side of the bush 5, a pressure p <b> 4 in the diameter expansion direction that attempts to expand the inner diameter acts on the bush 5. On the other hand, since the discharge of the high pressure water is restricted by the O-ring 6 on the outer peripheral surface side of the bush 5, the pressure p <b> 3 of the high pressure water acts also from the outer peripheral surface side of the bush 5.

  Thereby, the pressure p3 from the outer peripheral surface side is slightly larger than the pressure p4 from the inner peripheral surface side with respect to the bush 5, so that the inner diameter of the bush 5 is larger than that before the pressure of the high-pressure water acts. Is compressed and balanced. For this reason, even when the pressure of the high-pressure water is set high, the gap between the bush 5 and the shaft support portion 22 can be kept to a minimum.

  That is, since the pressure of the high pressure water on the inner peripheral surface side of the bush 5 is slightly reduced in the process of discharging the high pressure water, the outer peripheral surface of the bush 5 is more than the pressure in the tube expansion direction from the inner peripheral surface side of the bush 5. The pressure in the direction of diameter reduction from the side increases, so that the inner diameter of the bush 5 is balanced when it is compressed smaller than before the pressure of the high-pressure water acts, and as a result, the gap with the shaft support 22 is minimized.

  Specifically, the pressure p4 from the inner peripheral surface side of the bush 5 is gradually reduced in the process of leaking because it is close to the outlet. On the other hand, the pressure p3 from the outer peripheral surface side of the bush 5 is kept higher than the pressure p4 up to the position of the O-ring 6. For this reason, the pressure p3 from the outer peripheral surface side and the pressure p4 from the inner peripheral surface side of the bush 5 are set optimally so that the gap between the bush 5 and the shaft support portion 22 is kept to a minimum and smoothly slides. It is balanced so that it can move.

As a result, the discharge amount (leakage amount) of high-pressure water from the inner peripheral surface side of the bush 5 can be minimized. In addition, by minimizing leakage of high-pressure water, it is possible to efficiently increase the pressure of high-pressure water and improve cleaning performance.
According to the in-pipe cleaning nozzle 1 according to the present embodiment, the amount of high-pressure water leakage can be minimized, and therefore, for example, the pressure of high-pressure water is about twice that of the conventional type shown in FIG. , 200 MPa).

  Further, the high pressure water introduced into the head side sliding contact portion 42 is agitated or sheared to provide an uneven portion (33, 41) that regulates the rotation speed of the rotary nozzle portion 3, so that the viscous resistance and unevenness of the high pressure water are reduced. The rotational speed of the rotary nozzle part 3 can be controlled using the resistance caused by the vortex generated in the parts (33, 41) as a braking force. In addition, since the resistance of high-pressure water is used and no magnet is used, it is inexpensive and can maintain stable cleaning performance.

  And as shown in FIG.3 (b), by providing the uneven | corrugated | grooved part (33, 41) along the rotating shaft direction, without increasing the outer diameter of the rotating nozzle part 3 more than necessary, the uneven | corrugated | grooved part (33 , 41) can be secured, so that it can be applied to a small-diameter pipe cleaning nozzle, and the rotational speed of the rotary nozzle portion 3 can be controlled efficiently.

Next, an embodiment of the present invention will be described with reference to FIG. 4A and 4B are cross-sectional views for explaining an embodiment of the present invention, in which FIG. 4A shows Embodiment 1 in which an uneven portion constituting the brake portion is provided on the connecting portion side sliding contact portion, and FIG. Example 2 is shown in which the concavo-convex part constituting the part is provided in a direction perpendicular to the rotation axis of the rotary nozzle part.
In the following description, the description of the same configuration as the above-described embodiment will be omitted, and only the main differences will be described.

  In the above-described embodiment, the concave and convex portions (33, 41), which are brake portions that restrict the rotational speed of the rotary nozzle portion 3, are provided in the head-side sliding contact portion 42 (see FIG. 1). As shown in FIG. 4A, the in-pipe cleaning nozzle 1A according to No. 1 is provided with uneven portions (2A1, 3A1) in the connecting portion side sliding contact portion 24A.

  In the embodiment described above, the concavo-convex portions (33, 41) are formed in the head side sliding contact portion 42 disposed along the rotation axis direction (see FIG. 1), but the second embodiment of the present invention. As shown in FIG. 4B, the in-pipe cleaning nozzle 1B according to FIG. 4B has concave and convex portions (3B1, 4B1) formed in the sliding contact portion 42B1 disposed along the direction intersecting the rotational axis direction of the rotary nozzle portion 3B. You can also

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the above-described embodiment, the concavo-convex portions (33, 41) are formed in both the rotating nozzle portion 3 and the nozzle head 4, but the present invention is not limited to this, and the rotating nozzle portion 3 or the nozzle head 4 Either one may be used.

  In the above-described embodiment, the gaps δ1, δ2 in the coupling portion side sliding contact portion and the head side sliding contact portion are formed as the same gaps over the entire length of each sliding contact portion, but the present invention is not limited to this. It is also possible to form a large gap between the concave and convex portions (33, 41) constituting the brake portion. Further, the size of the gap in the direction orthogonal to the axial direction of the rotary nozzle portion 3 and the size of the gap in the direction along the axial direction can be made different.

It is sectional drawing for demonstrating the structure of the pipe cleaning nozzle which concerns on embodiment of this invention. It is a perspective view for demonstrating the structure of the pipe cleaning nozzle which concerns on embodiment of this invention. (A) is typical sectional drawing for demonstrating arrangement | positioning of the injection nozzle of a rotation nozzle part, shows the cross section along a flow path for convenience, (b) is for demonstrating the structure of a brake part ( It is XX sectional drawing of a), (c) is the elements on larger scale of (a) which show the flow of the high pressure water around a bush. It is sectional drawing for demonstrating the Example of this invention, (a) shows Example 1 which provided the uneven | corrugated | grooved part which comprises a brake part in the connection part side sliding contact part, (b) comprised a brake part. Example 2 in which the uneven portion to be formed is provided in a direction orthogonal to the rotation axis of the rotary nozzle portion is shown. It is typical sectional drawing for demonstrating the outline | summary of the conventional in-pipe washing nozzle.

Explanation of symbols

1 In-pipe cleaning nozzle 1A, 1B, 1C In-pipe cleaning nozzle 2 Shaft part 3 Rotating nozzle part 4 Nozzle head 5 (51, 52) Bush 6 O ring (sealing member)
22 Shaft support 23 Flow passage 24 Connection side sliding contact portion 33 Uneven portion (brake portion)
41 Concavity and convexity (brake part)
42 Head side sliding contact part 42d Discharge path

Claims (4)

A shaft portion having a connecting portion to which a high-pressure hose is connected, and a shaft support portion in which a flow passage through which a pressure fluid introduced from the high-pressure hose flows is formed;
An annular rotating nozzle portion that is rotatably fitted to the shaft support portion and has a jet port that is communicated with the flow passage and ejects the pressure fluid;
A nozzle head fixed to the tip of the shaft portion,
An in-pipe cleaning nozzle that is inserted into a pipe to be cleaned and cleans the inside of the pipe while the rotary nozzle portion is rotated by an injection reaction force that ejects the pressure fluid,
The rotating nozzle part is rotatably held via two bushes disposed at a predetermined interval on the shaft support part,
Via a flow chamber formed between the two bushes, provided a jet channel that flows from the flow passage to the jet port;
The sliding contact portion between the inner peripheral surface of the bush and the outer peripheral surface of the shaft support portion is provided with a predetermined gap that communicates with the flow passage and applies the fluid pressure of the pressure fluid from the inner peripheral surface side.
The sliding contact portion between the outer peripheral surface of the bush and the inner peripheral surface of the rotary nozzle portion facing the outer peripheral surface is provided with a sealing member that seals the discharge of the pressure fluid and communicates with the flow passage. And providing a predetermined gap for applying the fluid pressure of the pressure fluid from the outer peripheral surface side of the bush,
In-pipe cleaning nozzle. The sealing member is provided on an outer peripheral surface side of the bush at an edge portion on a side far from the flow passage and the ejection port;
The in-pipe cleaning nozzle according to claim 1. A discharge path for discharging a part of the pressure fluid through a predetermined gap provided on the inner peripheral surface side of the bush;
A brake portion having a predetermined gap provided in a head-side sliding contact portion where the rotating nozzle portion and the nozzle head face and come into sliding contact with each other,
The discharge passage communicates with the head side sliding contact portion, and the brake portion agitates or shears the pressure fluid discharged from the inner peripheral surface side of the bush to regulate the rotation speed of the rotary nozzle portion. The in-pipe cleaning nozzle according to claim 1, wherein the uneven portion is provided on at least one of the rotating nozzle portion and the nozzle head. A discharge path for discharging a part of the pressure fluid through a predetermined gap provided on the inner peripheral surface side of the bush;
A brake portion having a predetermined gap provided in a connecting portion side sliding contact portion where the rotating nozzle portion and the shaft portion face and come into sliding contact with each other,
The discharge passage communicates with the connecting portion side sliding contact portion, and the brake portion stirs or shears the pressure fluid discharged from the inner peripheral surface side of the bush to increase the rotation speed of the rotary nozzle portion. The in-pipe cleaning nozzle according to claim 1, wherein the uneven portion to be regulated is provided on at least one of the rotation slew portion and the shaft portion.

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